Hmm. Could theoretically be using radiowaves to generator enough energy to split water, or possibly some form of photochemical reaction which excites the water molecules that they split when they get rid of their excitation. Could also somehow involve the sodium in water getting burned but that's the wrong colour for that. It might be the wrong colour for hydrogen burning, I forget what that was.

It's endothermic. The radio waves photo-dissociate the water into hydrogen and oxygen. This takes exactly the same amount of energy that the oxidation would produce. Since the conversion of radio waves to energy in the water cannot be perfect, it takes much more energy than it produces.

_________________==============================================="A sufficiently-advanced technology is indistinguishable from magic."Arthur C. Clarke"Sufficiently advanced magic is indistinguishable from technology."Jack L. Chalker"Magic is just another way of saying 'I don't know how it works.'"Larry Niven"Any technology, no matter how primitive, is magic to those who don't understand it."Florence Ambrose